IN-PLUG

© Copyright 2005-2007 - ASIC Advantage, Inc. – All rights reserved

- Revision 11 – April 02, 2007

5 / 18

- P-channel Ron:

30

Ω typical

- N-channel Ron:

20

Ω typical

A series resistor R3 on pin3 should be added to further reduce EMI and minimize the noise injection which could

result from Miller-capacitance kick-back during transient conditions.

Examples of suitable MOSFETS:

-

IXYS PolarHT

™ and Polar HV™ MOSFET series: IXTY1R4N60P, IXTY2N60P, IXTY3N60P

-

Fairchild MOSFET series: FQPF1N60, FQPF 2N60, FQPF 3N60.

-

Infineon COOLMOS

-

Motorola MOSFET series: MTP1N60, MTP2N60, MTP3N60.

-

SGS-Thomson MOSFET series: STD1NB60, STD2NB60, STD3NB60. Etc…

Note: Due to the rapid evolution of MOSFET technologies, please check for current models when designing a new

SMPS.

PolarHT

Thermal shutdown:

An internal temperature sensing protection circuit disables the MOSFET gate drive when the temperature exceeds a

typical value of 150°C. This circuit has sufficient hysteresis to prevent relaxation. Normal operations therefore only

resume when the junction temperature has dropped below approximately 120°C.

Shunt bandgap regulator:

The IPS401 internal trimmed bandgap shunt regulator behaves like a 10V zener but also provides the 0.50V

reference for the voltage error amplifier, and the various internal bias current and voltages required by the different

blocks.

During start-up, the current consumption in the regulator is very low, typically 100

μA, allowing many possible

schemes to power the IPS401. Once the “zener” value is reached, the MOSFET gate drive is enabled and normal

operation starts. When enabled, the typical chip consumption is 660

μA plus the current necessary to drive the

MOSFET which depends on the MOSFET’s total gate charge and the frequency of operation (linked to L1

inductance value).

The VCC voltage is allowed to drop below the “zener” value during normal operations but the circuit will reset itself

and re-enter start-up mode should the VCC drop below approximately 8 volts.

The shunt regulator is sized to handle up to 50mA, which is especially useful to power the IPS401 with few

components only. Be careful however not to exceed the package rated power dissipation (see table p7).

ELECTRICAL CHARACTERISTICS

ABSOLUTE MAXIMUM RATING

Characteristics

Value

UNITS

- see fig 7-

60

mA

Peak drive output current (pin7)

Source=100, Sink=200

mA

Isense input voltage (pin 2)

0 / - 10

V

VLINE maximum input current (pin4)

700

μA

PDIL = 42, SOIC = 45

PDIL = 125, SOIC =155

°C / W

PDIL = 640, SOIC = 500

mW

Operating junction temperature

- 40 to 150

Storage temperature range

- 55 to 150

Lead temperature (3 mm from case for 5 sec.)

260

°C